{
  "html_body": [
    1,
    2,
    3,
    4,
    5
  ],
  "text_body": [
    1,
    2,
    3,
    4,
    5
  ],
  "attachments": [],
  "parts": [
    {
      "headers": [
        {
          "name": "content_type",
          "value": {
            "ContentType": {
              "c_type": "multipart",
              "c_subtype": "mixed",
              "attributes": [
                [
                  "boundary",
                  "1"
                ]
              ]
            }
          },
          "offset_field": 0,
          "offset_start": 13,
          "offset_end": 44
        },
        {
          "name": "mime_version",
          "value": {
            "Text": "1.0"
          },
          "offset_field": 44,
          "offset_start": 57,
          "offset_end": 62
        }
      ],
      "is_encoding_problem": false,
      "body": {
        "Multipart": [
          1,
          2,
          3,
          4,
          5
        ]
      },
      "offset_header": 0,
      "offset_body": 63,
      "offset_end": 610
    },
    {
      "headers": [
        {
          "name": "content_transfer_encoding",
          "value": {
            "Text": "binary"
          },
          "offset_field": 67,
          "offset_start": 93,
          "offset_end": 101
        },
        {
          "name": "content_type",
          "value": {
            "ContentType": {
              "c_type": "text",
              "c_subtype": "plain",
              "attributes": [
                [
                  "charset",
                  "utf-16le"
                ]
              ]
            }
          },
          "offset_field": 101,
          "offset_start": 114,
          "offset_end": 144
        }
      ],
      "is_encoding_problem": false,
      "body": {
        "Text": "Test message\n"
      },
      "offset_header": 67,
      "offset_body": 145,
      "offset_end": 171
    },
    {
      "headers": [
        {
          "name": "content_transfer_encoding",
          "value": {
            "Text": "base64"
          },
          "offset_field": 176,
          "offset_start": 202,
          "offset_end": 210
        },
        {
          "name": "content_type",
          "value": {
            "ContentType": {
              "c_type": "text",
              "c_subtype": "plain",
              "attributes": [
                [
                  "charset",
                  "utf-16be"
                ]
              ]
            }
          },
          "offset_field": 210,
          "offset_start": 223,
          "offset_end": 253
        }
      ],
      "is_encoding_problem": false,
      "body": {
        "Text": "Test message\n"
      },
      "offset_header": 176,
      "offset_body": 254,
      "offset_end": 291
    },
    {
      "headers": [
        {
          "name": "content_transfer_encoding",
          "value": {
            "Text": "base64"
          },
          "offset_field": 296,
          "offset_start": 322,
          "offset_end": 330
        },
        {
          "name": "content_type",
          "value": {
            "ContentType": {
              "c_type": "text",
              "c_subtype": "plain",
              "attributes": [
                [
                  "charset",
                  "utf-16le"
                ]
              ]
            }
          },
          "offset_field": 330,
          "offset_start": 343,
          "offset_end": 373
        }
      ],
      "is_encoding_problem": false,
      "body": {
        "Text": "Test message\n"
      },
      "offset_header": 296,
      "offset_body": 374,
      "offset_end": 411
    },
    {
      "headers": [
        {
          "name": "content_transfer_encoding",
          "value": {
            "Text": "base64"
          },
          "offset_field": 416,
          "offset_start": 442,
          "offset_end": 450
        },
        {
          "name": "content_type",
          "value": {
            "ContentType": {
              "c_type": "text",
              "c_subtype": "plain",
              "attributes": [
                [
                  "charset",
                  "EUC-JP"
                ]
              ]
            }
          },
          "offset_field": 450,
          "offset_start": 463,
          "offset_end": 491
        }
      ],
      "is_encoding_problem": false,
      "body": {
        "Text": "『世界人権宣言』"
      },
      "offset_header": 416,
      "offset_body": 492,
      "offset_end": 517
    },
    {
      "headers": [
        {
          "name": "content_transfer_encoding",
          "value": {
            "Text": "binary"
          },
          "offset_field": 522,
          "offset_start": 548,
          "offset_end": 556
        },
        {
          "name": "content_type",
          "value": {
            "ContentType": {
              "c_type": "text",
              "c_subtype": "plain",
              "attributes": [
                [
                  "charset",
                  "UTF-8"
                ]
              ]
            }
          },
          "offset_field": 556,
          "offset_start": 569,
          "offset_end": 596
        }
      ],
      "is_encoding_problem": false,
      "body": {
        "Text": "invalid"
      },
      "offset_header": 522,
      "offset_body": 597,
      "offset_end": 604
    }
  ]
}